JUST BAN HUMAN DRIVERS:

Google, a leader in efforts to create driverless cars, has run into an odd safety conundrum: humans.

Last month, as one of Google's self-driving cars approached a crosswalk, it did what it was supposed to do when it slowed to allow a pedestrian to cross, prompting its "safety driver" to apply the brakes. The pedestrian was fine, but not so much Google's car, which was hit from behind by a human-driven sedan.

Google's fleet of autonomous test cars is programmed to follow the letter of the law. But it can be tough to get around if you are a stickler for the rules. One Google car, in a test in 2009, couldn't get through a four-way stop because its sensors kept waiting for other (human) drivers to stop completely and let it go. The human drivers kept inching forward, looking for the advantage -- paralyzing Google's robot.

It is not just a Google issue. Researchers in the fledgling field of autonomous vehicles say that one of the biggest challenges facing automated cars is blending them into a world in which humans don't behave by the book.

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